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/**
* Context menu for links
* Largely mimics click_a.js
*/
(function () {
let longClick = false;
/**
* Go up at most [depth] times, to retrieve a parent matching the provided predicate
* If one is found, it is returned immediately.
* Otherwise, null is returned.
*/
function _parentEl(el: HTMLElement, depth: number, predicate: (el: HTMLElement) => boolean): HTMLElement | null {
for (let i = 0; i < depth + 1; i++) {
if (predicate(el)) {
return el
}
const parent = el.parentElement;
if (!parent) {
return null
}
el = parent
}
return null
}
/**
* Given event and target, return true if handled and false otherwise.
*/
type EventHandler = (e: Event, target: HTMLElement) => Boolean
const _frostCopyComment: EventHandler = (e, target) => {
if (!target.hasAttribute('data-commentid')) {
return false;
}
const text = target.innerText;
console.log(`Copy comment ${text}`);
Frost.contextMenu(null, text);
return true;
};
/**
* Posts should click a tag, with two parents up being div.story_body_container
*/
const _frostCopyPost: EventHandler = (e, target) => {
if (target.tagName !== 'A') {
return false;
}
const parent1 = target.parentElement;
if (!parent1 || parent1.tagName !== 'DIV') {
return false;
}
const parent2 = parent1.parentElement;
if (!parent2 || !parent2.classList.contains('story_body_container')) {
return false;
}
const url = target.getAttribute('href');
const text = parent1.innerText;
console.log(`Copy post ${url} ${text}`);
Frost.contextMenu(url, text);
return true;
};
const _getImageStyleUrl = (el: Element): string | null => {
// Emojis and special characters may be images from a span
const img = el.querySelector("[style*=\"background-image: url(\"]:not(span)");
if (!img) {
return null
}
return (<String>window.getComputedStyle(img, null).backgroundImage).trim().slice(4, -1);
};
/**
* Opens image activity for posts with just one image
*/
const _frostImage: EventHandler = (e, target) => {
const element = _parentEl(target, 2, (el) => el.tagName === 'A');
if (!element) {
return false;
}
const url = element.getAttribute('href');
if (!url || url === '#') {
return false;
}
const text = (<HTMLElement>element.parentElement).innerText;
// Check if image item exists, first in children and then in parent
const imageUrl = _getImageStyleUrl(element) || _getImageStyleUrl(<Element>element.parentElement);
if (imageUrl) {
console.log(`Context image: ${imageUrl}`);
Frost.loadImage(imageUrl, text);
return true;
}
// Check if true img exists
const img = element.querySelector("img[src*=scontent]");
if (img instanceof HTMLMediaElement) {
const imgUrl = img.src;
console.log(`Context img: ${imgUrl}`);
Frost.loadImage(imgUrl, text);
return true;
}
console.log(`Context content ${url} ${text}`);
Frost.contextMenu(url, text);
return true;
};
const handlers: EventHandler[] = [_frostImage, _frostCopyComment, _frostCopyPost];
const _frostAContext = (e: Event) => {
Frost.longClick(true);
longClick = true;
/**
* Don't handle context events while scrolling
*/
if (Frost.isScrolling()) {
console.log("Skip from scrolling");
return;
}
/*
* Commonality; check for valid target
*/
const target = e.target || e.currentTarget || e.srcElement;
if (!(target instanceof HTMLElement)) {
console.log("No element found");
return
}
for (const h of handlers) {
if (h(e, target)) {
e.stopPropagation();
e.preventDefault();
return
}
}
};
document.addEventListener('contextmenu', _frostAContext, true);
document.addEventListener('touchend', () => {
if (longClick) {
Frost.longClick(false);
longClick = false
}
}, true);
}).call(undefined);
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